{"id":2649,"date":"2008-07-17T12:17:00","date_gmt":"2008-07-17T12:17:00","guid":{"rendered":"https:\/\/test.simple-talk.com\/uncategorized\/a-quick-net-puzzle\/"},"modified":"2016-07-28T10:49:20","modified_gmt":"2016-07-28T10:49:20","slug":"a-quick-net-puzzle","status":"publish","type":"post","link":"https:\/\/www.red-gate.com\/simple-talk\/blogs\/a-quick-net-puzzle\/","title":{"rendered":"A Quick .NET Puzzle"},"content":{"rendered":"

<\/code>Just a quick .NET puzzle.  Does this application ever throw that ApplicationException?  If so, why?<\/code><\/p>\n

<\/code>
using System;
using System.Threading;<\/p>\n

class Program
{
    static long Num = 0;<\/p>\n

    static void Main(string[] args)
    {
        Thread t1 = new Thread(ModifyNum);
        t1.Start();
        while (true)
        {
            long k = Num;
            if (k != -1 && k != 0) throw new ApplicationException(
                \"k is not -1 or 0.  It is \" + k.ToString());
        }
    }<\/p>\n

    static void ModifyNum()
    {
        while (true)
        {
            if (Num == -1) Num = 0;
            else Num = -1;
        }
    }
}
<\/code><\/p>\n

Stuck?  Then here's a hint: if you change Num from a long to an int, it never throws the exception.<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"

Just a quick .NET puzzle.  Does this application ever throw that ApplicationException?  If so, why? using System;using System.Threading; class Program{    static long Num = 0;     static void Main(string[] args)    {        Thread t1 = new Thread(ModifyNum);        t1.Start();        while (true)        {            long k = Num;            if (k != -1 && k != 0) throw new ApplicationException(                ”k is not -1 or 0.  It is ” + k.ToString());        }    }     static void ModifyNum()    {        while……<\/p>\n","protected":false},"author":95472,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[],"coauthors":[],"class_list":["post-2649","post","type-post","status-publish","format-standard","hentry","category-blogs"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/posts\/2649","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/users\/95472"}],"replies":[{"embeddable":true,"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/comments?post=2649"}],"version-history":[{"count":2,"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/posts\/2649\/revisions"}],"predecessor-version":[{"id":41642,"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/posts\/2649\/revisions\/41642"}],"wp:attachment":[{"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/media?parent=2649"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/categories?post=2649"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/tags?post=2649"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/coauthors?post=2649"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}